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參數資料
| 型號： | AMBE2000 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | VOCODER CHIP |
| 中文描述： | 聲碼器芯片 |
| 文件頁數： | 39/47頁 |
| 文件大小： | 324K |
| 代理商： | AMBE2000 |
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AMBE-2000 Vocoder Chip
User’s Manual Version 3.0
page 39
Visit us at
www.dvsinc.com
Confidential Proprietary, Subject to Change
Table 7-B Rate Selection Using Rate I nfo 0-4, AMBE-2000 only
RATE_ SEL4
Pin
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
RATE_ SEL3
Pin
1
0
0
0
0
1
0
1
0
1
1
0
1
0
1
1
RATE_ SEL2
Pin
1
0
0
1
0
0
1
0
0
0
0
1
1
1
1
1
RATE_ SEL1
Pin
1
0
0
1
1
0
1
0
1
1
1
0
0
0
0
1
RATE_ SEL0
Pin
1
0
1
0
0
0
1
1
1
0
1
0
0
1
1
0
Speech Rate
(bps)
2000
3600
4000
2400
4800
4000
3600
2400
6400
4000
4400
8000
4000
9600
3600
2400
FEC Rate
(bps)
0
0
0
1600
0
800
1200
2400
0
2400
2800
0
4000
0
6000
7200
Total Rate
(bps)
2000
3600
4000
4800
6400
7200
8000
9600
7.3
Echo Cancellation
The AMBE-2000 Vocoder Chip provides a 16 millisecond echo canceller that is suitable for canceling the local echo caused
by a 2-to-4 wire hybrid and can achieve echo cancellation of approximately 30dB or more. Only the linear portion of the echo
is cancelled, so circuits should be designed to minimize non-linearities.
The AMBE-2000 Vocoder Chip echo canceller operates by sending a 240 millisecond audible training sequence to the A/D-
D/A immediately following a reset. Best results will be achieved if the analog circuit causing any echo is stable at this time. If
the analog circuit changes substantially following this training , the echo canceller must be re-initialized, by resetting the
AMBE-2000 Vocoder Chip for optimum performance.
Figure 7-A Typical Echo Path
AMBE-2000
Decoder
8kHz Speech Data
Encoder
8kHz Speech Data
A/D-D/A
4 to 2 wire
Converter
Echo Path A
Echo Path B
The Echo Return Loss (ERL) of the analog circuit must be 6dB or more (in diagram ERL = Echo Path A – Echo Path B) for
proper echo canceller operation. Linear A/D-D/A chips will generally provide better echo cancellation performance than
μ
law
or Alaw chips due to lower quantization noise.
The echo canceller can be activated either through the hardware pin 78, ECHOCAN_EN, or through the Control Word
interface described in section 5.2.9. See section 7.1 for important note about the ECHOCAN_EN pin.
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